The art of trading is the oldest way of business in the history. Is not that hard to learn how to trade. You just need to know how to correctly appreciate the value of things you want to trade and fix the right target for your goods. One more thing: you need to love what you are doing. You can't just sell things because you don't need them anymore or because are some low quality ones... No, this is scamming and you won't go so far with that.
You need to trade goods with some value, things in which you trust and which will serve as many people as possible.

the best way to trade is, you need to see and learn how to trade by investigate potential companies that have good histories and records in financial, performance, marketing strategy, and management. If these 4 important keys are logical to you, you may consider to buy the shares in that company. Make sure before you invest your money, you also must be ready with your budget, and be prepared for any kind of circumstances. don't use your whole budget to invest, and control yourself.